991676849 has 8 divisors (see below), whose sum is σ = 1033682688. Its totient is φ = 950471280.

The previous prime is 991676821. The next prime is 991676857. The reversal of 991676849 is 948676199.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991676849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (991676149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197537 + ... + 202494.

It is an arithmetic number, because the mean of its divisors is an integer number (129210336).

Almost surely, 2^991676849 is an apocalyptic number.

It is an amenable number.

991676849 is a deficient number, since it is larger than the sum of its proper divisors (42005839).

991676849 is a wasteful number, since it uses less digits than its factorization.

991676849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400135.

The product of its digits is 5878656, while the sum is 59.

The square root of 991676849 is about 31490.9010509385. The cubic root of 991676849 is about 997.2178833382.

The spelling of 991676849 in words is "nine hundred ninety-one million, six hundred seventy-six thousand, eight hundred forty-nine".